I have a question in regard to the grounded conductor brought to service equipment. I am installing an outdoor 500 kVA 3-phase 480V transformer that will feed a new facility. The transformer is 60 feet from the facility. Inside the facility will be a main power panel with main breaker, fed by three phase conductors and a neutral, where I plan to install the main bonding jumper to connect the grounded conductor (neutral) to the equipment grounding conductors, enclosure, and building grounding electrode system, per 250.24(A). At the transformer, the neutral is connected to the secondary X0 bushing, and this X0 bushing is connected to a transformer low voltage grounding electrode per 250.24(A)(2). All this is fairly straightforward.
The issue I have is that as part of the service, there will be a fused disconnect switch and metering cabinet, located 10 feet from the transformer. The way I read the code, the ?Service Equipment? would still be the main power panel in the facility, and the service disconnecting means would be the power panel main breaker, not the outdoor disconnect switch located remotely from the facility. Therefore I would not be required to make the neutral-to-ground connection at the disconnect switch, would not have to run a neutral conductor and separate ground conductor from the disconnect switch to the facility main power panel, and can make the bonding connection at the facility as planned. The disconnect switch enclosure would be bonded to the grounded conductor, which would provide a fault path directly back to the transformer X0 point.
Does this sound correct? It is the disconnect switch that I am questioning, as most people state that the neutral-to-ground connection must be made at the first disconnecting means.
The issue I have is that as part of the service, there will be a fused disconnect switch and metering cabinet, located 10 feet from the transformer. The way I read the code, the ?Service Equipment? would still be the main power panel in the facility, and the service disconnecting means would be the power panel main breaker, not the outdoor disconnect switch located remotely from the facility. Therefore I would not be required to make the neutral-to-ground connection at the disconnect switch, would not have to run a neutral conductor and separate ground conductor from the disconnect switch to the facility main power panel, and can make the bonding connection at the facility as planned. The disconnect switch enclosure would be bonded to the grounded conductor, which would provide a fault path directly back to the transformer X0 point.
Does this sound correct? It is the disconnect switch that I am questioning, as most people state that the neutral-to-ground connection must be made at the first disconnecting means.